Reid Hoffman talks about who Facebook’s biggest competitive threat would be, why Google has failed in two attempts to build a social platform and whether the latest will succeed, whether micropayments can work for categories other than games (Hint: News media, we’re still out of luck), the few investments he’s made outside the United States and why he doesn’t do more and how his value add is different when he’s wearing a VC hat and when he’s wearing an angel hat.